I am trying to help father in law with directv install. He needs one HD DVR but has 5 other SD tvs throughout the house. Can you use one SD box to run more than one TV? If so do you just split the signal coming out of the back of the SD box? What is the practial range of the RF remote? If I am in garage will it work for box that is inside house 30 feet away (single story)? Thanks for your help.